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Showing content from https://docs.microsoft.com/en-us/windows/desktop/api/Strmif/nf-strmif-icodecapi-getparameterrange below:

ICodecAPI::GetParameterRange (strmif.h) - Win32 apps

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The GetParameterRange method gets the range of values for a codec property.

This method applies only to properties whose values form a linear range.

HRESULT GetParameterRange(
  [in]  const GUID *Api,
  [out] VARIANT    *ValueMin,
  [out] VARIANT    *ValueMax,
  [out] VARIANT    *SteppingDelta
);

[in] Api

Pointer to a GUID that specifies the property to query. For a list of standard codec properties, see Codec API Properties.

[out] ValueMin

Pointer to a VARIANT that receives the minimum value of the property. The caller must free the VARIANT by calling VariantClear.

[out] ValueMax

Pointer to a VARIANT that receives the maximum value of the property. The caller must free the VARIANT by calling VariantClear.

[out] SteppingDelta

Pointer to a VARIANT that receives the stepping delta, which defines the valid increments from ValueMin to ValueMax. The caller must free the VARIANT by calling VariantClear.

If the VARIANT type is VT_EMPTY, any increment is valid.

This method can return one of these values.

E_INVALIDARG

S_OK

VFW_E_CODECAPI_ENUMERATED

The valid range for the property is [ValueMin... ValueMax], with increments of SteppingDelta. If a property supports a linear range of values, the property must use one of the following variant types:

• Unsigned types: VT_UI8, VT_UI4, VT_UI2, VT_UI1
• Signed types: VT_I8, VT_I4, VT_I2
• Floating-point types: VT_R8, VT_R4

If the property supports a list of values, instead of a range, the method returns

. In that case, call

to get the list of values.

Codec API Reference

Encoder API

ICodecAPI

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